Template types - Indicates whether the template is global ( it can be used with multiple entities) or applies to single entity.Data fields are highlighed like: {!Order: Name; Valued Customer}
Dynamics CRM automatically converts this data field to the entitie’s last name, otherwise you can include the data field if entity does not have a last name.

To add a data field to an E-mail template, click the Insert/Update button on the form toolbar. You can add data fields to both the subject and body of an E-mail template.

If you want to edit or add additional content to an email message before you send it, it can’t do with the direct email feature. If you insert multiple templates, the subject is determined by the last template inserted.

Personal/Sharing E-Mail Templates, Click 'File' tab in the ribbon -> Click 'Options' -> Click the 'E-mail Templates' tab -> a grid will display all of the E-mail templates ans their types -> Select to view/modify a E-mail template or Create new one.

Dynamics CRM will not send direct email messages if the Do Not Allow Bulk E-mails or Do Not E-mail attribute for the record is set to Do Not Allow.

Send direct email messages to many different entities such as Lead, Account, Contact, Opportunity, Quote, and Order.

Cannot preview your message before you send them.

Quick Campaign

Send a large number of email messages to a group of recipients, only apply to leads, accounts, contacts, and marketing lists.

Quick campaigns for E-mail, Fax, Appointment, Phone Call and Letter.

Quick campaigns save the group of records to which you sent the message for use future reference.

Select a group of records in a grid -> Click 'Quick Campaign' button from the ribbon -> Wizard that walks you through creating a mass email message.

Select Activity Type - E-mail and select the Mark e-mail messages to be sent and close corresponding e-mail activities option to send the email messages automatically when the wizard is completed. If option is not check, Dynamics CRM will create the email messages as open activities but won’t send them to recipients until someone sends each message individually.

A campaign response is a particular customer responded to one of your quick campaign efforts. Dynamics CRM does not automatically create campaign responses for you, you can create manually or data import.

Mail Merge

Mail merge from either the web client or Microsoft Dynamics CRM for Outlook.